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"You have often noticed them floating on the surface of the water, bent into a sort of semicircular shape, and without moving either body or limb?" "Yes yes; I have noticed it many a time." "Well, if you could have looked under the water then, you would have seen a fish somewhere upon the convex side of the semicircle.
The remedy is in the use of convex glasses to converge parallel rays of light before they enter the eye. The muscles of accommodation are thus relieved of their extra work. "Short sight," known as myopia, is one of the commonest defects of vision.
His slender convex silver cigarette-case invariably contained the only cigarettes worthy of the palate of a connoisseur, as his pipes were invariably the only pipes fit for the combustion of truly high-class tobacco. Old women, especially charwomen, adored him, and even municipal seigniors admitted that Harry was a smart-looking youth.
In lowering the eye while observing the plates, the rings of the convex plate will advance outward, those of the concave inward. It may be asked by the mechanician, Can this method be used for testing our surface plates? I answer that I have found the scraped surface of iron bright enough to test by sodium light.
While roughly speaking the limbs are symmetrical, each side not only has variety in itself, but there is usually variety of opposition. Supposing there is a convex curve on the one side, you will often have a concave form on the other. Always look out for this in drawing limbs, and it will often improve a poorly drawn part if more of this variation on symmetry is discovered.
Voltaire has not inaptly designated him "De l'or encroute de toutes les ordures de son siecle;" but the crust of superstition that enveloped his powerful mind, though it may have dimmed, could not obscure the brightness of his genius. To him, and apparently to him only, among all the inquiring spirits of the time, were known the properties of the concave and convex lens.
The aqueous humor is situated in the fore part of the eye, and is divided by the iris into what are called the anterior and posterior chambers of the eye. The crystalline humor, or lens, is situated immediately behind the aqueous humor, a short distance back of the pupil, and is a perfectly transparent double convex lens, closely resembling in shape the common burning glass.
Gresley began, who in the course of his pamphlet had thus gracefully designated the great religious bodies who did not view Christianity through the convex glasses of his own mental pince-nez. "In these days we see too much of that. I leave that to the Broad Church, who want to run with the hare and hunt with the hounds. I, on the contrary " But Hester had vanished.
The worthy Job received me with his wonted dignity and ease; his lodgings consisted of a first floor, furnished according to all the notions of Bloomsbury elegance viz. new, glaring Brussels carpeting; convex mirrors, with massy gilt frames, and eagles at the summit; rosewood chairs, with chintz cushions; bright grates, with a flower-pot, cut out of yellow paper, in each; in short, all that especial neatness of upholstering paraphernalia, which Vincent used not inaptly, to designate by the title of "the tea-chest taste."
It was the ray-fish with a flat head, ferocious eyes, and thong-like tail, moving the black mantle of its fleshy wings with a deliberation that rippled the edges. From the sandy bottom was struggling forth a convex shield that, when floating, showed its lower face smooth and yellow. The four wrinkled paws and the serpent-like head of the turtle were emerging from its cuirass of tortoise-shell.
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